A television has a power cord but a remote controller does not have a cord ,why?

In order to make the TV function, you need electricity to turn it on. The controller does not do anything with its electricity. The controller only turns on and off the TV and changes its channel. Think of it like a remote controlled or radio controlled car. You cannot use the RC car if there are no batteries in the RC car (also the remote but it already has batteries like a TV's remote controller), just like TV needs electricity in order to turn it on.

Explanation:

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.